<?php
/**
 * Created by PhpStorm.
 * User: JSQ-SL
 * Date: 2018/10/15
 * Time: 13:28
 */
$a = ['ss'=>'000','ff'=>0,'gg'=>''];
var_dump(isset($a['ss']));
var_dump(isset($a['ff']));
var_dump(isset($a['gg']));
var_dump(isset($a['jj']));